High Knob Overlook
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the High Knob Overlook clear sky chart from 2005-11-05 to 2017-10-06.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
28%
15061
15%
47092
8%
15026
36%
15026
18%
32474

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
12%
719
12%
2506
3%
716
23%
716
9%
1852
January16th to endNight
11%
768
14%
2508
3%
768
24%
768
11%
1810
February1st to 15thNight
8%
704
12%
2287
1%
701
20%
701
10%
1706
February16th to endNight
11%
631
16%
1931
4%
631
26%
631
13%
1411
March1st to 15thNight
15%
720
16%
2045
5%
720
27%
720
14%
1496
March16th to endNight
19%
768
19%
2067
5%
768
30%
768
17%
1457
April1st to 15thNight
17%
718
14%
1796
3%
718
23%
718
17%
1332
April16th to endNight
26%
720
17%
1800
4%
720
33%
720
24%
1221
May1st to 15thNight
31%
439
17%
1519
8%
439
42%
439
17%
1022
May16th to endNight
38%
374
16%
1497
13%
374
47%
374
18%
933
June1st to 15thNight
40%
360
14%
1440
11%
360
50%
360
18%
930
June16th to endNight
49%
360
14%
1440
15%
360
58%
360
24%
834
July1st to 15thNight
48%
340
13%
1360
14%
340
54%
340
23%
805
July16th to endNight
56%
430
16%
1468
15%
404
62%
404
27%
861
August1st to 15thNight
56%
539
16%
1609
12%
536
60%
536
29%
1007
August16th to endNight
57%
738
20%
1884
12%
738
59%
738
32%
1216
September1st to 15thNight
43%
720
22%
1800
10%
720
47%
720
29%
1204
September16th to endNight
47%
717
25%
1967
17%
717
52%
717
31%
1251
October1st to 15thNight
36%
684
19%
2051
14%
684
45%
684
23%
1351
October16th to endNight
21%
704
14%
2121
6%
704
33%
704
18%
1502
November1st to 15thNight
25%
700
17%
2277
10%
700
36%
700
19%
1524
November16th to endNight
20%
720
14%
2511
8%
720
31%
720
13%
1774
December1st to 15thNight
15%
720
10%
2520
4%
720
22%
720
9%
1916
December16th to endNight
11%
768
10%
2688
2%
768
21%
768
9%
2059

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
17%8%36%5%35%45%7%32%
48109
Night
16%8%36%5%3445%6%35%
47267
Cloud CoverDay
16%8%36%6%35%45%7%32%
48119
Night
15%8%36%5%3445%7%35%
47272
TransparencyDay
51%6%10%19%11%1
47802
Night
48%6%12%20%11%1
47092
SeeingDay
21%15%28%19%10%4
5670
Night
19%17%30%22%8%
15063

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
15%11%5%9%7%45%436%24%
1432
16th to endDay
12%15%6%10%8%36%446%22%
1716
February1st to 15thDay
16%14%6%7%6%45%5%45%23%
1575
16th to endDay
16%11%49%7%34345%27%
1542
March1st to 15thDay
17%10%5%7%5%35%35%5%29%
1903
16th to endDay
16%11%5%7%423346%32%
2157
April1st to 15thDay
20%10%46%423445%33%
2152
16th to endDay
16%8%35%434446%38%
2165
May1st to 15thDay
22%7%35%5%24446%32%
2436
16th to endDay
18%6%25%5%35%46%8%32%
2618
June1st to 15thDay
17%5%35%6%35%5%5%7%32%
2520
16th to endDay
16%6%25%6%36%5%5%8%34%
2520
July1st to 15thDay
11%5%35%6%46%6%7%8%33%
2520
16th to endDay
10%5%25%6%47%6%7%8%35%
2598
August1st to 15thDay
15%6%36%6%45%5%6%8%31%
2340
16th to endDay
14%5%25%6%445%7%8%34%
2306
September1st to 15thDay
18%6%35%5%34447%37%
2160
16th to endDay
17%6%24423335%45%
1990
October1st to 15thDay
19%8%25%433347%38%
1707
16th to endDay
23%8%35%6%345%45%28%
1749
November1st to 15thDay
16%9%35%5%1445%6%36%
1581
16th to endDay
21%10%35%424445%32%
1446
December1st to 15thDay
19%13%5%9%6%45%235%23%
1440
16th to endDay
18%13%5%8%5%35%45%7%22%
1536
January1st to 15thNight
16%11%48%6%34446%27%
2506
16th to endNight
12%10%5%8%6%35%45%7%28%
2508
February1st to 15thNight
14%12%5%7%5%46%5%5%6%27%
2285
16th to endNight
14%10%38%7%35%45%5%30%
1931
March1st to 15thNight
17%9%47%5%3445%6%32%
2033
16th to endNight
15%8%35%5%24445%38%
2067
April1st to 15thNight
21%9%45%424346%33%
1796
16th to endNight
16%5%34424346%43%
1800
May1st to 15thNight
21%5%246%24446%37%
1519
16th to endNight
14%5%25%5%35%45%7%40%
1495
June1st to 15thNight
18%425%42435%8%38%
1440
16th to endNight
12%5%134345%7%10%41%
1440
July1st to 15thNight
10%425%5%245%7%9%42%
1440
16th to endNight
11%42442446%9%44%
1568
August1st to 15thNight
10%4244445%5%8%44%
1620
16th to endNight
12%5%2442445%7%47%
1884
September1st to 15thNight
14%5%15%433437%45%
1800
16th to endNight
14%5%25%423346%47%
1967
October1st to 15thNight
19%6%3342324445%
2051
16th to endNight
21%8%35%423446%34%
2121
November1st to 15thNight
14%9%35%5%24446%39%
2277
16th to endNight
18%10%36%5%3445%6%30%
2511
December1st to 15thNight
21%10%5%8%5%35%35%6%24%
2520
16th to endNight
19%11%46%6%45%5%5%7%22%
2688

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
15%10%6%10%7%45%446%24%
1432
16th to endDay
12%15%6%10%8%45%446%22%
1716
February1st to 15thDay
17%13%6%7%7%35%5%45%23%
1575
16th to endDay
15%12%49%7%34445%27%
1542
March1st to 15thDay
17%11%5%7%6%35%446%28%
1914
16th to endDay
16%12%5%7%5%23337%32%
2156
April1st to 15thDay
20%11%37%423346%32%
2152
16th to endDay
16%9%35%434346%38%
2165
May1st to 15thDay
21%7%26%5%34347%32%
2436
16th to endDay
18%6%26%5%35%45%8%32%
2618
June1st to 15thDay
17%5%36%6%45%5%48%32%
2520
16th to endDay
15%6%25%7%35%5%5%8%33%
2520
July1st to 15thDay
11%5%36%6%46%6%6%9%33%
2520
16th to endDay
10%5%25%6%47%6%7%8%34%
2598
August1st to 15thDay
15%7%26%7%445%6%8%31%
2340
16th to endDay
15%426%6%345%6%8%34%
2306
September1st to 15thDay
17%6%25%5%3445%5%38%
2160
16th to endDay
17%6%25%413336%45%
1990
October1st to 15thDay
18%8%25%33335%7%38%
1707
16th to endDay
23%8%25%5%445%5%5%28%
1749
November1st to 15thDay
16%9%35%43346%6%35%
1581
16th to endDay
21%10%35%5%24446%31%
1446
December1st to 15thDay
19%13%5%9%6%35%335%23%
1440
16th to endDay
18%13%48%6%35%5%5%6%22%
1536
January1st to 15thNight
16%11%5%8%6%345%46%26%
2506
16th to endNight
12%10%5%7%6%45%46%7%28%
2508
February1st to 15thNight
14%11%5%7%5%46%446%27%
2278
16th to endNight
14%10%47%7%35%45%6%30%
1931
March1st to 15thNight
17%9%47%5%3445%6%31%
2045
16th to endNight
15%9%35%5%34446%37%
2067
April1st to 15thNight
19%10%5%4423347%32%
1796
16th to endNight
16%5%25%424446%43%
1800
May1st to 15thNight
20%6%26%425%445%37%
1519
16th to endNight
13%6%26%5%245%5%7%40%
1495
June1st to 15thNight
18%5%25%433448%38%
1440
16th to endNight
11%5%144246%6%11%41%
1440
July1st to 15thNight
10%425%5%25%5%6%9%41%
1440
16th to endNight
10%5%2443346%10%43%
1568
August1st to 15thNight
10%4245%35%5%5%8%43%
1620
16th to endNight
11%6%24424447%46%
1884
September1st to 15thNight
14%6%25%433337%45%
1800
16th to endNight
13%5%34423346%47%
1967
October1st to 15thNight
18%8%2441334444%
2051
16th to endNight
21%8%35%5%23446%34%
2121
November1st to 15thNight
14%10%35%424446%39%
2277
16th to endNight
18%11%36%5%2445%6%30%
2511
December1st to 15thNight
20%10%6%7%6%34446%24%
2520
16th to endNight
18%12%47%6%46%45%7%22%
2688

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
59%7%9%15%6%1
1433
16th to endDay
63%410%14%6%
1716
February1st to 15thDay
62%5%7%15%7%
1577
16th to endDay
57%48%19%7%
1542
March1st to 15thDay
57%411%18%7%
1914
16th to endDay
52%5%8%20%12%1
2157
April1st to 15thDay
52%48%19%12%1
2152
16th to endDay
45%5%7%20%16%3
2165
May1st to 15thDay
52%5%9%20%10%1
2436
16th to endDay
48%7%12%17%11%1
2622
June1st to 15thDay
49%7%11%20%10%
2520
16th to endDay
46%7%13%21%9%
2520
July1st to 15thDay
46%8%11%19%13%1
2371
16th to endDay
42%8%16%19%12%
2435
August1st to 15thDay
48%8%12%19%11%
2327
16th to endDay
44%8%10%22%12%1
2306
September1st to 15thDay
46%5%10%21%15%
2160
16th to endDay
41%5%9%21%19%2
1990
October1st to 15thDay
46%6%11%20%14%
1707
16th to endDay
56%5%10%19%7%
1749
November1st to 15thDay
47%6%12%18%11%3
1581
16th to endDay
52%6%10%19%9%
1446
December1st to 15thDay
64%411%13%5%
1440
16th to endDay
60%7%12%14%5%
1536
January1st to 15thNight
57%6%11%14%7%1
2506
16th to endNight
53%5%11%18%9%
2508
February1st to 15thNight
56%6%10%17%7%
2287
16th to endNight
53%5%9%20%10%
1931
March1st to 15thNight
52%5%11%20%9%1
2045
16th to endNight
48%5%12%19%13%1
2067
April1st to 15thNight
51%49%19%12%1
1796
16th to endNight
41%5%10%21%18%2
1800
May1st to 15thNight
47%5%10%21%13%1
1519
16th to endNight
41%8%13%20%14%2
1497
June1st to 15thNight
45%6%11%25%10%
1440
16th to endNight
34%8%15%27%12%1
1440
July1st to 15thNight
38%6%13%26%13%1
1360
16th to endNight
34%7%16%25%13%2
1468
August1st to 15thNight
35%7%16%24%14%
1609
16th to endNight
36%6%11%26%18%1
1884
September1st to 15thNight
39%6%9%25%17%1
1800
16th to endNight
38%410%25%19%1
1967
October1st to 15thNight
43%5%10%22%16%1
2051
16th to endNight
51%413%21%9%
2121
November1st to 15thNight
45%6%13%18%12%3
2277
16th to endNight
53%5%12%18%10%
2511
December1st to 15thNight
60%6%12%14%6%
2520
16th to endNight
60%6%13%13%5%
2688

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
25%38%25%8%11
60
16th to endDay
28%30%31%6%2
94
February1st to 15thDay
28%33%33%4
90
16th to endDay
24%29%34%10%
201
March1st to 15thDay
25%24%31%15%2
270
16th to endDay
22%25%30%13%5%3
288
April1st to 15thDay
27%25%27%14%41
270
16th to endDay
18%18%32%17%7%5%
270
May1st to 15thDay
35%17%22%10%10%3
288
16th to endDay
20%14%26%19%14%3
331
June1st to 15thDay
19%14%29%24%10%1
315
16th to endDay
20%11%33%23%7%2
315
July1st to 15thDay
15%9%30%24%17%3
305
16th to endDay
9%6%30%30%17%5%
326
August1st to 15thDay
14%7%23%28%17%7%
313
16th to endDay
15%423%26%15%14%
332
September1st to 15thDay
18%11%24%18%20%8%
315
16th to endDay
17%7%22%21%19%12%
314
October1st to 15thDay
22%8%22%24%16%5%
278
16th to endDay
27%19%31%16%4
270
November1st to 15thDay
22%17%27%25%7%
235
16th to endDay
28%13%39%16%1
66
December1st to 15thDay
30%30%23%10%5%1
60
16th to endDay
29%31%35%3
64
January1st to 15thNight
20%25%37%13%2
720
16th to endNight
18%27%37%15%1
768
February1st to 15thNight
22%27%38%10%
704
16th to endNight
21%26%37%13%1
631
March1st to 15thNight
24%27%31%14%2
720
16th to endNight
21%24%32%14%7%
768
April1st to 15thNight
24%24%31%16%3
718
16th to endNight
20%18%33%20%7%
720
May1st to 15thNight
23%12%26%26%10%
439
16th to endNight
14%9%29%30%14%1
375
June1st to 15thNight
18%9%24%33%13%
360
16th to endNight
12%428%43%10%
360
July1st to 15thNight
13%427%38%15%
340
16th to endNight
11%318%45%18%2
430
August1st to 15thNight
12%220%41%21%2
539
16th to endNight
11%418%35%26%2
738
September1st to 15thNight
15%8%25%30%17%1
720
16th to endNight
16%8%20%25%23%6%
717
October1st to 15thNight
23%11%22%25%15%1
684
16th to endNight
25%16%32%21%3
704
November1st to 15thNight
18%17%34%23%5%
700
16th to endNight
24%20%31%18%41
720
December1st to 15thNight
25%24%32%15%2
720
16th to endNight
25%24%35%12%2
768
Page generated at 2017-10-07 14:07:50. Version ac04

Copyright 2017 A. Danko


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